1,4-cyclohexadiene-1,2-dicarbonitrile, 4,5-dichloro-3,6-dioxo- 4,5-dichloro-3,6-dioxocyclohexa-1,4-diene-1,2-dicarbonitrile InChI=1/C8Cl2N2O2/c9-5-6(10)8(14)4(2-12)3(1-11)7(5)1